The Flippening: Unisex Names Go From Blue To Pink

I may be too much of a cryptocurrency geek, but there was a popularly held idea in 2017 that the cryptocurrency Ethereum would overtake Bitcoin in total market cap. It never happened (as you can see from the chart below), but it was referred to as the Flippening.

A similar phenomenon has happened with some boy and girl names over time. In particular, in recent decades, it seems that many names that were traditionally male names have flipped and become more popular female names.